Lock.



Patented Aug. 26, |902.

filtrante/1p H. BRYDA.

LUCK.

(Appxieation fued Nov. 9, 1901.

(No Model.)

ma Nonms PETERS co, PHcTaLYHo.. WASHINGTON, n. c.

Unrrnn STATES PATENT FFICE.

HENRY BRYDA, OF VOONSOCKET, RHODE ISLAND.

LOCK.

SPECIFICATION forming part of Letters Patent No. 707,757, dated August 26, 1902. Application tiled November 9. 1901. Serial No. 81.776. (No model To all whom t may concern:

Be it known that I, HENRY BRYDA, a citizen of the United States, residing at Voonsocket, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Door-Locks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to door-locks, and has for its object to provide a lock incapable of being manipulated except by the particular key made for it, the key and cooperating parts of the lock being of a construction peculiar to themselves, whereby liability of the lock being opened by any other than its own key will be reduced to the minimum.

W'ith this and other objects in view the invention consists of certain novel features of construction, combination, and arrangement of parts, as will be hereinafter more fully described, and particularly pointed out in thel appended claim.

In the accompanying drawings, Figure lis a front elevation of a lock embodying my invention. Fig. 2 is a view of the interior of the lock, showing in full and broken lines the bolt projected and retracted. Fig. 3 is a similar view with the bolt removed. Fig. 4 is a cross-section through the lock, illustrating the action ofthe key; and Fig. 5 is adetail view of the key.

Referring now more particularly to the drawings, the numeral l represents a lockcasing havinga removable front plate 2, -provided with the keyhole The keyhole is provided with a segmental guide 4 to receive and direct the stem of the key and is formed with a curved or hook-shaped portion 5 and a guide-lug 6. The segmental guide 4 receives a hollow or tubular guide-piece 7, projecting forwardly from the back wall of the casing, and one of the edges of the keyhole is provided with a groove 8 and a projection 9 to cooperate with a corresponding projection l0 and groove ll on the bit of the key l2. The key has a hollow or tubular stem in which is arranged a guide-pin 7, cooperating with the tubular guide-piece 7, and its bit 13 is bifureated and formed with spaced hookshaped portions 14, the said hook-shaped portions forming a passage for the reception of the guide-lug (5 on the front plate 2. The peculiar formation of the key and the parts on the lock-case cooperating therewith render it practically a matterof impossibility to insert a key differing in any particular from the construction of key made for use in connection with any particular lock, so that liability of the lock being opened by any other than its own key will be reduced to the minimum.l

The key-bolt l5 has a reduced shank 1G, provided in its upper edge with two series of notches 17 and 18, with which coperate a plate-spring tumbler i9, having a shoulder 20 to en gage said notches and adependingtongue 2l, the terminal end of which is mounted on the free end of a spring 22, whereby said shoulder is thrown into and out of operation by the spring 22, operated upon by the key 12. The spring 22 is secured at one end to a pin or stud 22, fixed to the casing, and is looped intermediate of its length to embrace a second pin or stud 22", also fixed to the casing. The opposite or free end 22 of the spring extends upon one side of theV shank 16 immediately beneath the tongue 21 of the tumblerspring 19 and forms an extended bearing for the key, whereby the tumblerspring is retracted to withdraw the pawl from engagement with the bolt and permit it to move downward to bring the shoulder into action. The shank of the bolt has formed in its outer face a notch or recess 23 of segmental form and adapted to receive the hookshaped divided bit portions of the key, said notch or recess decreasing the thickness of the plate, so that the portion forming the rear wall of the notch will fit in the space between the two hook-shaped portions of the key, 'allowing the latter to be turned to move the bolt in one direction or the other and to operate the retracting portions of the springs. When the key is inserted in the Alock in the manner shown in Fig. 4 and is turned into operative position, it will be seen that one ofthe hook-shaped portions of the key lits within the segmental notch or recess 23, while the other bears against the under side ofthe ret-racting-spring. When the key 4is turned in one direction or the other-for instance, in the direction to project the lockthe thin web or rear wall of the bolt occupies IOO the recess in the web of the key and the two hook-shaped portions ride up, one into the notch 23 and the other against the spring 22. 'lhis action of the keylifts the tongue 21. of the pawl-spring, whereby the pawl member thereof is thrown out of engagement with the notches 18, leaving the bolt free to be projected by the turning of the key. After the key has been turned to the right as far as possible it swings out'of the notch or recess and out of engagement with the spring 22', whereupon the spring-pawl is released and resulnes its normal position and its pawl portion engages the notches 17 to hold the boltlock against retract-ion. When the key is inserted to retract the bolt, it is moved in the opposite direction to that described and a similar action takes place, the pawl being raised from engagement with the notches 18 and the bolt thrown back, the pawl being again released by the downward movement of thespring 22 and engaging the notches 18 to hold the bolt locked in its retracted position. The free end or arm 22/ of the spring is engaged by one of the portions of the divided bit of the key. When the key is turned in one direction, this divided portion of the bit comes into contact with the spring and forces the same upwardly, by means of which the tongue 21 of the spring 19 is uplifted, so as to withdraw the shoulder 20 from engagement with the bolt, leaving the latter free to he projected by the key. When the key is moved in the reverse direction, `the bit turns down out of engagement with the spring-arm 22 and the latter is restored to its normal position by its own resiliency, allowing the spring 12J to again project the shoulder 2O into engagement with the bolt and lock the same in retracted position. It will thus be seen that the spring 22 forms an extended bearing and in one direction of movementof the key lifts the shoulder out of engagement with the bolt and in the other direction of movement of the key permits the shoulder to return to its normal position and lock the bolt. t

From the foregoing description, taken in connection with the accompanying drawings, the construction, mode of operation, and advantages of the invention will be readily understood, and it will be seen that a lock is provided which is comparatively simple in construction, adapted to cooperate with a certain type of key so constructed that all liability of the lock being manipulated by other than the key manufactured expressly for use in connection therewith will be avoided.

Changes in the form, proportion, and minor details of construction may be made within the scope of the inventionwithout departing from the spirit or sacrificing any of the advantages thereof.

Having thus described my invention, what I desire and claim by Letters Patent is- In a lock, the combination with the casing, a sliding bolt therein having a shank provided with upper edge notches, a segmental recess formed in the face of the shank, aspring having a projecting free end arranged to slide between the rear wall of the casing and rear surface of the shank, a second spring having a shoulder and a tongue, the former seated in the notches and the latter having its terminal end mounted on the free end of the first-mentioned spring, of a key having hooks on its operating end with a space between them, said space adapted to straddle the edge of the shank below the recess to permit the hooks of the key, one of which coacts with the under surface of the free projecting end of one ofthe springs to raise the tongue of the other spring to disengagethe shoulder thereof from the notches, the other hook of the key adapted to engage the recess in the shank so as to slide the bolt forward or rearward, substantially as specified.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

HENRY BRYDA.

Witnesses:

ANDRREJ ARMATA, WILLIAM LANDRY.

eiiective in operation, and 

